Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b3fa7907aef031…

MALICIOUS

PDF

91.3 KB Created: 2021-07-23 16:18:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6922c7591f126a90d7feb4f11560e83b SHA-1: c6618a852fcd58400f9a97cdf801eed51974ef70 SHA-256: b8b3fa7907aef03112bea1446e4f50bcb4f5064b7f2a6d0cc2ba4fcd153db4f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm, likely to direct users to malicious content or phishing sites. The embedded JavaScript, though not fully analyzed due to obfuscation, is a common method for initiating malicious actions within PDFs. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c897614d940a676dcb9926e2bc2dd0e5/15488947628.pdf In PDF document text
    • https://warungmimpishio.com/contents//files/86060832536.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4116e80e0---38871411993.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/q5791tbil4pc7cntj6tnpk53r8/93194330833.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dade8e0dd71---51637980159.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081638e57001---fibisutiteziv.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160803734b42fc---wijiwatugafewitewamovego.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/vafexaximekaduzusigofor.pdfIn PDF document text
    • https://viratrip.com/basefile/travelasreviracom/files/20689974767.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/53472395720.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a3cc185e0---dewudetowisopixiwajuti.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160753685dcf10---xezepuxewabovexeju.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c0beddc1088---pewutaxikivibiragofuwadev.pdfIn PDF document text
    • http://momsystem.ru/public/file/senixogejep.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd5d1f417f---12002427103.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab7c9c99d0---pefosakibagol.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/joneju.pdfIn PDF document text
    • https://majubesar.com/contents//files/77599678374.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/zijodenoguvumazarubeme.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/n3uj0bjpmbgi53aqp9ibo3t23c/3908609555.pdfIn PDF document text
    • https://bnovum.hu/downloads/16324660091.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/dojupakorubetaligexa.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/zenedome.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2379c2bf2e19e211b575c4a269b77bd5/xodalokis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+is+the+pathophysiology+of+pneumothoraxPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10186 16392 bytes
SHA-256: 9d0a0c409947859ea5556e7dc8153682761521bd30687eea080375c52b277120
font_01_sfnt_off00012c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C19 11116 bytes
SHA-256: 0e090c858862efb32e80aac7902f46fda88d7a3044e1e887ecb7811453cffc06
font_02_sfnt_off000145e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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